OK Guys,

What should I be looking to achieve in terms of temperature and humidity in the humidity cabinet for rust bluing?

Thanks!

In the summer I do not use a box at all. In Memphis the whole damn place is a humidity cabinet. Otherwise I like 85/85.

I was taught the old 80/80 rule( not that our instrumentation was that accurate )
and that more humidity was detrimental
(no reference text--just the old smith I worked with)

My cabinet measures 1x1x4. I use a 40 watt bulb under the water pan for heat. I've never checked the temp or the humidity. 4-6 hrs per application usually does it.

Sorry to be so low tech, but it works for me.

I run 90/90 in my cabinet. I use a line-voltage thermostat to control temp and a vent in the top to regulate humidity.

Old refrigerators work great.
timan